Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7da5a2fd8f5089e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 11:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b543ea4d3009b168a353f9687eac8c02 SHA-1: 88d95053c0dc85d3d159a244edd1676fb8fce352 SHA-256: c7da5a2fd8f5089eeff0dcedf97efb64842e8372143235c1903e6e7f37a2b619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The primary purpose appears to be redirecting users to other malicious PDF files hosted on these compromised sites, likely as part of a phishing campaign or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=systems+of+equations+review+worksheet+pdf PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/08b1565d0310fc193e769ca80a971651/jimezazokifoxuxakelusafo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5dd2c2cc---14466151910.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rofopudovu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/58155242261.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tewakevudo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607763d886b91---fowedobivanozabunogajowew.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86806b2764bd8a5a00fd63e0ecf78f20/taneji.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/fb9d4c70623c24a5967744242dea5889/gabofajodap.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6am639ss1u868aqmp1oqt7fjg6/66428596745.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/50d4921f15b93d1dbb2489ba513a5cb0/kedosilalapijor.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1736eacbe8b1ad28915f7ee4cc170490/togibodotakowezanon.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081d149f7f---kiduvomiwiwuza.pdfIn PDF document text
    • http://aven.su/userfiles/file/72711340065.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/nusibakadapajepe.pdfIn PDF document text
    • http://fygl.net/uploads/file/032028455295.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/7426331667.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/64402952716.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a728b79c---vagebewo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4d7872b7---belaxaremasejubo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612071fd8bc0d---mowutabiwajomemew.pdfIn PDF document text
    • https://birudongker.com/contents//files/xugomerixulal.pdfIn PDF document text
    • http://usateatop.com/_upload/files/vexoxorukuna.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///90398686729.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac97f6522a548f12ed488241d6f57acb/lisifafupajupadivaw.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/67116858677.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7629400433.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 19300 bytes
SHA-256: 5ffceacbf2d9f358806f13b1bdf56604a70ae4a43bdf02b7fe864b093bc04770
font_01_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 11396 bytes
SHA-256: 879484d4457a89da048ffa1a9bfce68e257996711319c222d1675b6c15b4c5e2
font_02_sfnt_off000141c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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